Billy Spleen, nicknamed Bill-E by himself, is a character from Darren Shan's The Demonata series. He is half-brother of the main protagonist, Grubbs Grady, but he believed that Dervish was his father (and therefore, Grubbs his cousin) until Lord Loss revealed the truth in book 6, Demon Apocalypse. He suffered from the same disease (Lycanthropy) that led to the death of Gret Grady at the hands of demons. Dervish and Grubbs saved his life but he was not informed of that fact until a few months later. He also has a noticeably lazy eye. He is featured in Lord Loss, Slawter, Blood Beast, and Demon Apocalypse, and he plays a major role in the series. Although he and Grubbs were close at the start of the series, in Slawter and Blood Beast, their relationship is constantly tested by Grubbs's new f